Granted Patent
Utility
US 4,291,104 · App. 06/073,326
Brazed corrosion resistant lined equipment
Inventor:
Hibbard G. Keifert
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Sep 7, 1979
Inventor
Hibbard G. Keifert
Assignee (at issue)
Fansteel Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.